A traditional place to imagine physics beyond the standard model is at energies which are just beyond those which are currently accessible. I will review the motivation for looking for new physics which is not as heavy, but is difficult to see because it is weakly coupled. The possibilities are limitless, so an organizing principle is needed to focus attention. I will discuss the likely places for such light, weakly coupled new physics to show up, using dimensional analysis. Particularly promising places to look are rare Higgs decays, rare heavy flavor decays, and neutrino oscillations.

Argonne Physics Division Colloquium Schedule